<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
  {{message}}
</div>

<script src="../js/vue%20.js"></script>
<script>
  const app = new Vue({
      el: '#app',
      data: {
          message: ''
      }
  })
</script>
</body>
</html>